Enable some off-by-default checks
Enable some off-by-default checks

Some of the available checks are disabled by default, like:
[H106] Don’t put vim configuration in source files
[H203] Use assertIs(Not)None to check for None

Change-Id: I4b7cc70025a56e19aad7ffc2caec307e5f70500e

openstack/os-brick,openstack/os-brick